That's about how much I get, but I cheat
I realized that that stuff is REALLY THICK, so I add water to stretch it out. Not too much water to dilute its effectiveness, but enough water to get the consistency that I want, so it isn't so thick. It still works the same!
I get another empty conditioner bottle that's about 16 oz. I half it with water (8 oz. of water), then put some of the R&N in there (about 4 oz.) Shake, shake, shake...
Sometimes I put some oil in there for shine, sometimes honey for moisture, sometimes some Nexxus Emergencee for some protein/strength.... once I even mixed some coconut milk! Whatever I want
One more tip...I realize it works best when my hair is not towel-dried. So I only apply it to soaking wet, drippy hair. I also get more uses out of it this way.
Oh, and I am also very heavy-handed; my hair is very thick, even when wet. But I try to keep in mind about what Macherie said about less is more. Your hair will absorb as much as it needs, so don't glob it on. I save a lot of the conditioner following this advice.